Count null values

Description

Count null values

Usage

<Expr>$null_count()

Value

A polars expression

Examples

library("polars")

df <- pl$DataFrame(
  a = c(NA, 1, NA),
  b = c(10, NA, 300),
  c = c(1, 2, 2)
)
df$select(pl$all()$null_count())

#> shape: (1, 3)
#> ┌─────┬─────┬─────┐
#> │ a   ┆ b   ┆ c   │
#> │ --- ┆ --- ┆ --- │
#> │ u32 ┆ u32 ┆ u32 │
#> ╞═════╪═════╪═════╡
#> │ 2   ┆ 1   ┆ 0   │
#> └─────┴─────┴─────┘